Look, it's really simple. First off, Running is as pure a measure of athletic ability as you'll ever get. The sport, for the most part doesn't require the money, equipment or exclusive clubs white-dominated sports like ice hockey, skiing or golf. No need for access to a swimming pool or exclusive golf club, or for your parents to buy you expensive gear to play in the snow or a kayak to paddle.
Now, having established that black men overwhelmingly dominate every running event from the 100m - marathon (Of course you could bring up the likes of the Seb Coe and ElG, but they're exceptions); truth is black people of West African descent dominate sprinting and black East Africans dominate middle and distance running. Even hurdles/steeple. No two ways. So what's the argument about?